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About the Am3517 the serial coupled with the DMA mode, the test lost data

dongsheng wang
Prodigy 20 points

Hello, everyone!
I tested linux kernel 2.6.37 kernel serial port driver, DMA enabled, the test lost a few problems. However, DMA disabled, it defaults to the interrupt mode, I tested without any problems. Why is coupled with DMA will be problems, FIFO trigger the problem?